The prototype 9.5 deck aluminum block was assembled to our “Hardcore” spec and tested extensively. The brief build specs: 427, (4.125 x 4.00) 9.8 compression, solid cam, 4500 carb, World Windsor Sr. aluminum heads (2.08x1.60), pump gas. The iron version is rated at 525HP and they have been pulling 540 to 550HP regularly of late.
This made 560HP at 6300 and 6400 RPM and peaked 527 lbft at 4800. Starting at 3500 RPM it pulled 496lbft and it made over 500lbft from 4000 to 5700RPM.
The contention that aluminum blocks “always lose power” (compared to iron) is disproved here we believe, because of our use of ductile iron sleeves which are inherently stronger than cast iron. All of our aluminum block designs use the ductile sleeves and never show a power deficit to their iron counterparts. This one surprised by making more.
More testing for this block will begin next week with our brand-new 18° 4-bolt and 10° 6-bolt head programs.
Blocks, shorts and complete engines will be available in 8.2 and 9.5 configurations in late July.
